Die



Nov. l, 1932. F. s. ISPEICHER 1,885,385

DIE

Filed Feb. 2. 1932 2 sheets-sheet 1 MJU IN VEN TOR f @La TORNEY5 Nov. l, 1932. F. s. SPEICHER 158355335 DIE Filed Feb. 2. 1932 2 Sheets-Shea?. 2

a INVENTOR. 1 a.

@MA/Aq ATTORNEYS Patented Nov. 1, 1932 UNITED A "sffTArEsv ImreNr ortica i YFRANKLIN, s. srnronnn, or PITTSBURGH, PENNSYLVANIA, AssrGNoR rro M. n. p

CUNNINGHAM coMPANSLjA ooRroBArrON or Y:PENNSYLVANIA DIE Application mea February 251982. serial' N8. 590,453.

The invention relates to dies or embossing devices designed *particularlyv for the making of automobile plates but useful-mother relations and for a wide variety vof work.` It

35 has for its objects the provision ofan im` proved construction in whichthe die parts are pivoted together, so that thelr relative position is 'positively established, but which permits the dies to approach in parallelism during the actual'stamping operation'. Further objects are; the provision of a con# struction in which the strain imposed onl the pivot is practically negligible, so thatthere is little wear at this point; (-2) which requires no guiding means, aside from -the hinge connection between the die holders; and (3) in which any tendency to impart movement to the plate being stamped in its yown plane is toward the gage or stop means between the dies and pivots, so that the blank is maintained against any displacement incident to the stamping operation. One em-l bodiment of the invention is shownin the accompanying drawings, wherein: y

Figure l is a plan view of the apparatus (closed). Fig. 2 is a section on the line II-II of Fig. 1 with the parts in open position. Fig. 3 is a similar sectionwith the parts in the position occupied just as the die" is ready to act upon the plate to be emL bossed. And Fig. 4 is another section similar to that of Figs. 2 and 3, but with the parts in completely `closed stamping or embossing position.

Referring to the drawings, 1 is the bottom die holder in which is removably mounted the die plate 2, and 3 is the top die holder which carries the removable die plate 4. The bottom holder or member is provided with a handle 5 and with a transverse groove 6 which serves to position and hold the dies in the anvil or base in which the pair of die members, in company with a series of others, are mounted. I y

The member 1 is provided' at its rear end with a pair of upstandingflanges 7, 7 between which is pivoted the rear end of the top member 3. Located between the die plates and the hinge connection between the die holders is a spring 8, which normally holds the die members in open position, as indicated in Fig. 2, so that when thevoperating plunger'which moves thetlopdiemember is-retracted, the dies open, permitting the removal of the embossed plate and the-insertion of a new blank. rlhe flanges 7, 7 act as a housing for the spring and their forward ends vor shoulders actas stops for positioning the blank 9l to be pressed, as indicated' in Figs. 1 to 3. Thestopshoul- Y ders also serve as a protection against blanks l being accidentally pushed back against 'the lspring and interfering with the action or injuring it. f v Y I The hinge-connection between the die hold7 er, which is the primary feature of novelty in ythe construction,'comprises a pivot pi'n 10, y

mounted" at its ends in the flanges 7 7 i and a sleeve 11 journalledon the pin 10 and mount-V ed" for oscillation in the end of the ktop die member 3.Y TheY sleeve is slottedas indicated at 12 in Figs. 2, 3 and 4, the purpose being to provide aineans'for limiting the osci'llating'movef ment ofthefsleeve in the eXtreme positions showniin 1Figs.3V and l4. The stop means for limiting the oscillatingfmovement is the' 75 'Screw 18. y j When thefdie'l is 'in vthe complete open position, the sleeve llloccupies the position shown in Fig.y 2. This position is maintained unt'ilthe die reaches the lposition Vshown linl Fig. 3'with the upper die plate `,4 having its face infengagement'with the blank 9 which is to be embossed. nAt thistime .the diemembers 1 and"3 are'in-substantial`V parallelism, which parallelism willfbemaintained until the stamping or 'embossinga'ction' isv completed Vasshown in Fig. 4. When the operating plunger or platen which engages the top of the member movesfdown, carrying the member 3 lfrom the position of Fig. `3 to the final positionrof Fig. 4, the eccentricsleeve turns ina counter 'clockwise direction about the pin 10 from the position of Fig. 3 to that of^Fig. 4. This Vlowerifn g of the center line of the. sleeve permits the top di e to move down maintained in" parallelism with'y the bottom die throughi out the stamping operation, that is, without any tiltingy factionr during such operation.

During the movement of the topdie from'the positioniof Fig. 3'to that of Fig. 4,such die M necessarily moves slightly to the left and back to the right due to the movement of the center line of the sleeve about the center line of the pin l as an axis, but this movement is very limited and has no unfavorable effect either upon the blank or dies. T he Afirst lateral movement to the left does not displace the blank since the end of the blank engages the ends of the flanges 7, 7 which thus act as gage means for positioning the blanks.

The opera-tion as above `described imposes little strain or wear upon the hinge parts Y which in service show no appreciable wear after long periods of use. At the same time the guiding function of the hinge parts obviates the yuse lof guide shoulders or other guide means upon the opposing die members, such as have heretofore been required where hinged dies were associated for approach in parallel planes. rI`he spring 8 is protected from injury, vthe ends of the flanges 7, 7 serving the ydual function of positioning the blanks and protecting vthe spring from such blanks. @ther advantages incident to the cheapness and simplicity of the construction and its positive action will be apparent to those skilled in the art.

What I claim is:

l. In combination in a die construction, a bottom .die member, a top die member, and a hinge Connection at the ends of the mem* bers :comprising a sleeve mounted for oscillation `in one of the members, means for limiting such oscillation, and a pivot pin extending through the `sleeve eceentrically thereof and through the other 'of said members.

2. In combination in a die construction, a bottom die member, a top die member, a hinge connection at the ends of the members comprising a sleeve mounted for oscillation through the other of said members, and a spring between the die members intermediate the `dies and the hinge connection for normally maintaining the `members in separated position.

3. In combination in a die construction, a bottom die member, a top die member, and a hinge connection at the ends of the members comprising a sleeve mounted for oscillation in the top member, means for limiting such oscillation, and a pivot pin extending through the bottom member and through lthe sleeve eccentrieally thereof.

4;. In combination in a die construction, a bottom die member, a top die member, a hinge connection at the ends of the members comprising a sleevemounted for oscillation in the top member, means for limiting such oscillation, and a pivot pin extending through the bottom member and through the sleeve eccentrica-Hy thereof, and a spring between the die members intermediatethe dies and the hinge connection for normally maintaining the members in separated relation.

5. In combination in a die construction, a bottom die member having a. pair of spaced upstanding flanges at its rear end, a bottom die member, a hinge connectionat the ends of the members comprising a sleeve mounted for limited oscillation in the top member, and a pivot pin extending through the sleeve eccentrically thereof and journalled at its ends 'in said flanges, and a spring lying between the members in the space between said flanges and normally maintaining the members in open position, the forward end of said flanges being located so as to act as a gage or stop for :the: plates which are positioned on the bottom Vdie member.

6. In combination in a die construction, a bottom die member, a top die member, vand a hinge connection at the ends of the members comprising a pivot pin mounted inthe lower die member, and .a member pivoted on the pin and also pivoted in the upper die member on' center with respect to said pivot pin, permitting the upper die member to swing about the pivot pin as an axis and also to have an approximate parallel movement with respect to .the lower member when such upper member approaches closed position.

In testimony whereof, I have hereunto subscribed my name this l30th day of January, 1932.

F. S. SPEICHER. 

